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Guar gum, a plant colloid, costs less than agar and is better suited for growing thermophilic bacteria, but is also more difficult to handle, being more viscous and less transparent. The bacterial polysaccharide xanthan is cheaper as well but forms weaker jellies that, as with carrageenan, might result in puncturing its surface. Other colloids, like alginate (from brown seaweed) and gellan gum (from a bacterium), don’t set solely based on temperature and require additives for gelation. These additives might interfere with microbial growth and make the preparation of those jellies less handy than agar plates.。关于这个话题,爱思助手下载最新版本提供了深入分析
Same Poop, Different Results: At-Home Gut Health Tests Are Wildly Inconsistent. New research has found that different gut health testing companies can provide wildly different results from the same fecal sample.
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